unique: unrecognized failures

[gopherbot]

#!watchflakes
default <- pkg == "unique" && test == ""

Issue created automatically to collect these failures.

Example (log):

FAIL	unique [build failed]
# unique [unique.test]
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x5e48fd2]

goroutine 1167 gp=0xc003b0ce00 m=3 mp=0xc000080008 [running]:
panic({0x6275460?, 0x6883b40?})
	runtime/panic.go:806 +0x168 fp=0xc0004149a8 sp=0xc0004148f8 pc=0x575ce08
runtime.panicmem(...)
	runtime/panic.go:262
...
runtime.chansend(...)
	runtime/chan.go:283
runtime.chansend1(0xc003f28700, 0xc00465b570)
	runtime/chan.go:161 +0x35a fp=0xc000e69fb0 sp=0xc000e69f40 pc=0x56ea61a
cmd/compile/internal/gc.compileFunctions.func3.1()
	cmd/compile/internal/gc/compile.go:172 +0x3f fp=0xc000e69fe0 sp=0xc000e69fb0 pc=0x603a83f
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc000e69fe8 sp=0xc000e69fe0 pc=0x57647c1
created by cmd/compile/internal/gc.compileFunctions.func3 in goroutine 5
	cmd/compile/internal/gc/compile.go:170 +0x247

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "unique" && test == ""

2025-01-16 19:36 go1.24-darwin-amd64_14 release-branch.go1.24@6b605505 unique (log)

FAIL	unique [build failed]
# unique [unique.test]
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x5e48fd2]

goroutine 1167 gp=0xc003b0ce00 m=3 mp=0xc000080008 [running]:
panic({0x6275460?, 0x6883b40?})
	runtime/panic.go:806 +0x168 fp=0xc0004149a8 sp=0xc0004148f8 pc=0x575ce08
runtime.panicmem(...)
	runtime/panic.go:262
...
runtime.chansend(...)
	runtime/chan.go:283
runtime.chansend1(0xc003f28700, 0xc00465b570)
	runtime/chan.go:161 +0x35a fp=0xc000e69fb0 sp=0xc000e69f40 pc=0x56ea61a
cmd/compile/internal/gc.compileFunctions.func3.1()
	cmd/compile/internal/gc/compile.go:172 +0x3f fp=0xc000e69fe0 sp=0xc000e69fb0 pc=0x603a83f
runtime.goexit({})
	runtime/asm_amd64.s:1700 +0x1 fp=0xc000e69fe8 sp=0xc000e69fe0 pc=0x57647c1
created by cmd/compile/internal/gc.compileFunctions.func3 in goroutine 5
	cmd/compile/internal/gc/compile.go:170 +0x247

— watchflakes